PHP添加文字水印或图片水印的水印类完整源代码与使用示例


						PHP实现的给图片添加水印功能，可添加文字水印或图片水印，使用文字水印时需要提供字体文件，使用图片水印时需要提供水印图片，水印图片不能比要添加水印的图片大，请使用背景透明的水印图片。

该水印类支持自定义水印位置、自定义水印大小和水印的透明度，字体水印可自定义颜色等，功能已相应完善。

完整源代码如下(注解中已给出使用示例)：





<?php

/**

 * 图片加水印类，支持文字水印、透明度设置、自定义水印位置等。

 * 使用示例：

 *   $obj = new WaterMask($imgFileName);  //实例化对象

 *   $obj->$waterType = 1;   //类型：0为文字水印、1为图片水印

 *   $obj->$transparent = 45;   //水印透明度

 *   $obj->$waterStr = 'www.zwyuanma.com';  //水印文字

 *   $obj->$fontSize = 18;   //文字字体大小

 *   $obj->$fontColor = array(255,255,255);  //水印文字颜色（RGB）

 *   $obj->$fontFile = 'AHGBold.ttf';  //字体文件

 * ……

 *   $obj->output();    //输出水印图片文件覆盖到输入的图片文件

 */

class WaterMask{

  public $waterType     = 0;   //水印类型：0为文字水印、1为图片水印

  public $pos        = 0;   //水印位置

  public $transparent    = 45;   //水印透明度

  public $waterStr      = 'www.zwyuanma.com';  //水印文字

  public $fontSize      = 18;   //文字字体大小

  public $fontColor     = array(255,255,255);  //水印文字颜色（RGB）

  public $fontFile      = 'AHGBold.ttf';  //字体文件

  public $waterImg      = 'logo.png';  //水印图片

  private $srcImg       = '';   //需要添加水印的图片

  private $im         = '';   //图片句柄

  private $water_im      = '';   //水印图片句柄

  private $srcImg_info    = '';   //图片信息

  private $waterImg_info   = '';   //水印图片信息

  private $str_w       = '';   //水印文字宽度

  private $str_h       = '';   //水印文字高度

  private $x         = '';   //水印X坐标

  private $y         = '';   //水印y坐标

  function __construct($img) {    //析构函数

    $this->srcImg = file_exists($img) ? $img : die('"'.$img.'" 源文件不存在！');

  }

  private function imginfo() { //获取需要添加水印的图片的信息，并载入图片。

    $this->srcImg_info = getimagesize($this->srcImg);

    switch ($this->srcImg_info[2]) {

      case 3:

        $this->im = imagecreatefrompng($this->srcImg);

        break 1;

      case 2:

        $this->im = imagecreatefromjpeg($this->srcImg);

        break 1;

      case 1:

        $this->im = imagecreatefromgif($this->srcImg);

        break 1;

      default:

        die('原图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');

    }

  }

  private function waterimginfo() { //获取水印图片的信息，并载入图片。

    $this->waterImg_info = getimagesize($this->waterImg);

    switch ($this->waterImg_info[2]) {

      case 3:

        $this->water_im = imagecreatefrompng($this->waterImg);

        break 1;

      case 2:

        $this->water_im = imagecreatefromjpeg($this->waterImg);

        break 1;

      case 1:

        $this->water_im = imagecreatefromgif($this->waterImg);

        break 1;

      default:

        die('水印图片（'.$this->srcImg.'）格式不对，只支持PNG、JPEG、GIF。');

    }

  }

  private function waterpos() { //水印位置算法

    switch ($this->pos) {

      case 0:   //随机位置

        $this->x = rand(0,$this->srcImg_info[0]-$this->waterImg_info[0]);

        $this->y = rand(0,$this->srcImg_info[1]-$this->waterImg_info[1]);

        break 1;

      case 1:   //上左

        $this->x = 0;

        $this->y = 0;

        break 1;

      case 2:   //上中

        $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;

        $this->y = 0;

        break 1;

      case 3:   //上右

        $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];

        $this->y = 0;

        break 1;

      case 4:   //中左

        $this->x = 0;

        $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;

        break 1;

      case 5:   //中中

        $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;

        $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;

        break 1;

      case 6:   //中右

        $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];

        $this->y = ($this->srcImg_info[1]-$this->waterImg_info[1])/2;

        break 1;

      case 7:   //下左

        $this->x = 0;

        $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];

        break 1;

      case 8:   //下中

        $this->x = ($this->srcImg_info[0]-$this->waterImg_info[0])/2;

        $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];

        break 1;

      default:  //下右

        $this->x = $this->srcImg_info[0]-$this->waterImg_info[0];

        $this->y = $this->srcImg_info[1]-$this->waterImg_info[1];

        break 1;

    }

  }

  private function waterimg() {

    if ($this->srcImg_info[0] <= $this->waterImg_info[0] || $this->srcImg_info[1] <= $this->waterImg_info[1]){

      die('水印比原图大！');

    }

    $this->waterpos();

    $cut = imagecreatetruecolor($this->waterImg_info[0],$this->waterImg_info[1]);

    imagecopy($cut,$this->im,0,0,$this->x,$this->y,$this->waterImg_info[0],$this->waterImg_info[1]);

    $pct = $this->transparent;

    imagecopy($cut,$this->water_im,0,0,0,0,$this->waterImg_info[0],$this->waterImg_info[1]);

    imagecopymerge($this->im,$cut,$this->x,$this->y,0,0,$this->waterImg_info[0],$this->waterImg_info[1],$pct);

  }

  private function waterstr() {

    $rect = imagettfbbox($this->fontSize,0,$this->fontFile,$this->waterStr);

    $w = abs($rect[2]-$rect[6]);

    $h = abs($rect[3]-$rect[7]);

    $fontHeight = $this->fontSize;

    $this->water_im = imagecreatetruecolor($w, $h);

    imagealphablending($this->water_im,false);

    imagesavealpha($this->water_im,true);

    $white_alpha = imagecolorallocatealpha($this->water_im,255,255,255,127);

    imagefill($this->water_im,0,0,$white_alpha);

    $color = imagecolorallocate($this->water_im,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]);

    imagettftext($this->water_im,$this->fontSize,0,0,$this->fontSize,$color,$this->fontFile,$this->waterStr);

    $this->waterImg_info = array(0=>$w,1=>$h);

    $this->waterimg();

  }

  function output() {

    $this->imginfo();

    if ($this->waterType == 0) {

      $this->waterstr();

    }else {

      $this->waterimginfo();

      $this->waterimg();

    }

    switch ($this->srcImg_info[2]) {

      case 3:

        imagepng($this->im,$this->srcImg);

        break 1;

      case 2:

        imagejpeg($this->im,$this->srcImg);

        break 1;

      case 1:

        imagegif($this->im,$this->srcImg);

        break 1;

      default:

        die('添加水印失败！');

        break;

    }

    imagedestroy($this->im);

    imagedestroy($this->water_im);

  }

}

?>



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